On 15.09.2020 12:20, [email protected] wrote:
So it is not possible to keep the original format code 1 and ffmpeg will always 
create an EXTENSIBLE container??
Because some software is not able to use the Ext GUIDs.
Havent found anything in the ffmpeg format documentation.

I don't think such an option on WAV format level exists at the moment. Usually the WaveFormatExtensible variant is written by audio software in case of bit-width > 16 or channel count > 2.

What are the output properties in your case (FFmpeg console output)? And what software did you try opening the output file with?

Regards, Tobias

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